Nebivolol Ameliorates Cardiac NLRP3 Inflammasome Activation in a Juvenile-Adolescent Animal Model of Diet-Induced Obesity.

Nebivolol Ameliorates Cardiac NLRP3 Inflammasome Activation in a Juvenile-Adolescent Animal Model of Diet-Induced Obesity.
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奈必洛尔改善饮食引起肥胖的青少年动物模型中的心脏 NLRP3 炎症小体激活

DOI:
10.1038/srep34326
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发表时间:
2016-09-30
期刊:
影响因子:
4.6
通讯作者:
Gao P
Gao P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xie Q;Wei T;Huang C;Liu P;Sun M;Shen W;Gao P

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NLRP3参与肥胖诱导的心脏重塑和功能障碍。在这项研究中,我们在青少年-青少年饮食性肥胖动物模型中评估了奈比洛尔的心脏保护作用是否依赖于降低NLRP3的激活。断奶雄性Sprague-Dawley大鼠分别饲喂标准饲料(ND)和高脂肪饲料(HFD) 8周。随后将肥胖大鼠再分为3组:1)HFD对照组;2) HFD低剂量纳比洛尔(5 mg/kg/d);3) HFD联合大剂量奈比洛尔(10mg /kg/d)。用奈比洛尔治疗可预防hfd诱导的肥胖相关的过量心脏脂质积累以及心肌线粒体功能障碍。奈比洛尔减轻肥胖大鼠心肌促炎细胞因子分泌和NLRP3炎性体活化。同时,奈比洛尔治疗肥胖动物增加心脏β3-AR表达,逆转内皮一氧化氮合酶(eNOS)的减少。在体外,纳比洛尔处理棕榈酸培养的H9C2细胞抑制自噬,恢复线粒体生物发生,导致线粒体活性氧(mtROS)的产生减少,抑制NLRP3炎性体的激活。同时,shRNA对β3-AR或eNOS的作用减弱了奈比洛尔的保护作用。这些数据表明,奈比洛尔对心肌脂肪毒性的有益作用可能通过改善线粒体功能障碍来抑制NLRP3炎性体的激活。
NLRP3 is involved in obesity-induced cardiac remodeling and dysfunction. In this study, we evaluated whether the cardiac protective effects of nebivolol relied on attenuating NLRP3 activation in a juvenile-adolescent animal model of diet-induced obesity. Weaning male Sprague-Dawley rats were fed with either a standard chow diet (ND) or a high-fat diet (HFD) for 8 weeks. The obese rats were subsequently subdivided into three groups: 1) HFD control group; 2) HFD with low-dose nebivolol (5 mg/kg/d); 3) HFD with high-dose nebivolol (10 mg/kg/d). Treatment with nebivolol prevented HFD-induced obesity associated excess cardiac lipid accumulation as well as myocardial mitochondrial dysfunction. Nebivolol attenuated pro-inflammatory cytokines secretion and NLRP3 inflammasome activation in myocardium of obese rats. In parallel, nebivolol treatment of obese animals increased cardiac β3-AR expression, reversing the reduction of endothelial nitric oxide synthase (eNOS). In vitro, nebivolol treatment of palmitate-incubated H9C2 cells suppressed autophagy, restored mitochondrial biogenesis, leading to decreased mitochondrial reactive oxygen species (mtROS) generation, and suppressed NLRP3 inflammasome activation. Meanwhile the presence of shRNA against β3-AR or against eNOS deteriorated the protective effects of nebivolol. These data suggest the beneficial effect of nebivolol on myocardial lipotoxicity contributing to inhibiting NLRP3 inflammasome activation possibly via improved mitochondrial dysfunction.
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